MORTGAGE AND OTHER NOTES PAYABLE (Details) (USD $)				9 Months Ended	1 Months Ended					9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Construction Loans City Point	Sep. 30, 2014 Unsecured Debt Unsecured credit facility Line of Credit	Sep. 30, 2014 Unsecured Debt Unsecured credit facility Line of Credit LIBOR January 31, 2016	Sep. 30, 2014 Unsecured Debt Unsecured credit facility Line of Credit LIBOR January 31, 2018	Sep. 30, 2014 Unsecured Debt Unsecured credit facility Line of Credit LIBOR November 25, 2019	Sep. 30, 2014 Unsecured Debt Unsecured Credit Facility, Term Loan [Member]	Sep. 30, 2014 Unsecured Debt Unsecured Credit Facility, Term Loan [Member] November 25, 2019	Sep. 30, 2014 Line of Credit Subscription Line Fund IV
Mortgage Loans on Real Estate [Line Items]
Proceeds from lines of credit				$ 15,000,000
Repayments of long-term debt				15,000,000						68,800,000
Long-term line of credit				0
Mortgage and other notes payable	1,141,066,000	1,039,997,000						50,000,000	50,000,000	67,400,000
New mortgage loans										67,400,000
Basis spread on variable rate					1.55%	1.40%	1.30%
Unused fee percentage					0.35%	0.25%
Construction loan, amount released into restricted cash			198,500,000
Construction loan, amount withdrawn from restricted cash			149,200,000
Construction loan, amount released into restricted Cash, amount available			$ 49,300,000